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To: zsh-users@zsh.org
From: "Scott Frazer (scfrazer)" <frazer.scott@gmail.com>
Subject: Re: Completion of two items separated by a dash
Date: Fri, 29 Jun 2018 11:54:43 -0400
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 <d448e5c3-2f8e-0950-ad39-9ce2eb932eeb@gmx.com>
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On 6/28/2018 4:03 PM, Eric Cook wrote:
> On 06/28/2018 03:40 PM, Scott Frazer (scfrazer) wrote:
>> I am trying to write a completion function for a command that takes two items separated by a dash, and the second item depends on the first. For example, suppose possible full completions were:
>>
>> foo-bar
>> foo-baz
>> abc-def
>> abc-xyz
>>
>> Ideally, the completion function would first present options "foo" and "abc", then after the user chooses one it inserts the "-', and when you hit tab again it presents either "bar" and "baz" or "def" and "xyz".
>>
>> For this simple example I could just show all four, but in real life there are many first items and many second items and the list would be huge.
>>
>> I have written some simple completions before, but this has me stumped. Is there a way to do this?
>>
>> Thanks,
>> Scott
>>
> 
> 
> _foo() {
>    local -a ary
>    ary=( foo-bar foo-baz abc-def abc-xyz )
>    _arguments '1:description:_multi_parts -- - ary'
> }
> compdef _foo foo
> 

Thanks!  This was tantalizingly close, but _multi_parts wasn't handling 
completion of the first part the way I prefer.  For example, if possible 
completions were:

foo-abc
foobar-xyz

and I type 'foo<TAB>', I like completion to give me the two options 
'foo' and 'foobar', but _multi_parts would see a 'complete' match and 
insert 'foo-' without asking about the ambiguity.

I did finally get things they way I wanted.  If anyone comes upon this 
thread in the future, here is basically what I ended up with:

_foo() {

     local curcontext="$curcontext" state

     _arguments -C '*: :->foo' && return 0

     case "$state" in
         foo)
             if compset -P '*[-]'; then
                 local first=${IPREFIX%-}
                 local second=<do something using $first to get values>
                 _values "second" $second
             else
                 local first=<do something here to get values>
                 _values -s - "first" $first
             fi
             ;;
     esac
}

_foo "$@"